Perovskites

Researchers at the CEA-Leti institute (a MicroLED Association member institute) developed green and red-emitting thin-film perovskite color conversion layers (CCLs) using pulsed laser deposition (PLD), that can be used in microLED microdisplays.

The researchers say that while QDs provide a good solution for color conversion microLED displays, they suffer from low absorption, which means that require a thickness of 3-10 micron, which is a challenge for very small microLEDs, required for microdisplays.

MicroLED-Connect is the microLED industry's top event series, offering a combination of exciting online webinars and a flagship annual on-site event. Our next meeting is on 23-25 September 2025, at the High Tech Campus, Eindhoven, Netherlands. MicroLED-Connect is co-organised by TechBlick and the MicroLED Industry Association and offers the best way to connect with the global MicroLED and AR/VR display industries and markets.

In this article, we will share a few short videos from past events. First up, we have Continental's Kai Hohmann that discusses how the company looks at the four competing display technologies, and the opportunities for microLED technology in the automotive industry.

China-based Yicai Core Light (also known as Yicai Xinguang Technology) says that it is preparing to start producing its microLED microdisplays in the autumn of 2025, in a pilot production line that will be build with help from Ningbo-based Yongjiang Laboratory.

Yicai's microLED platform is based on blue microLEDs and QD color conversion. Interestingly, the company uses perovskite-based quantum dots, saying that these cadmium-free QDs deliver increased performance. Yicai is partnering with application developers including both TCL and Meizu.

Researchers from the Chinese Academy of Sciences, University of Science and Technology of China and Jilin University developed a novel method for the remote epitaxial growth of continuous crystalline perovskite thin films, that allows for seamless integration into ultrahigh-resolution microLED displays - with pixels less than 5 μm.

The results of their research describe a remote epitaxial growth technique that utilizes a graphene interlayer to create continuous crystalline perovskite thin films over an area of 4 cm². This method effectively eliminates grain boundaries and achieves a pure out-of-plane crystallographic orientation. Using these single-crystalline, freestanding perovskite thin films, the researchers achieved impressive results for micro-LEDs, including electroluminescence efficiency of 16.1%, brightness of 4 × 105 cd m^-2, and ultrahigh resolution with a pixel size of 4 μm.

We're happy to announce the 2025 edition of The Perovskite Handbook. This book is a comprehensive guide to perovskite materials, applications and industry. Perovskites are an exciting class of materials that feature a myriad of exciting properties and are considered the future of solar cells, displays, sensors, LEDs and more. The perovskite industry is at an inflection point, with dramatic investments and commitments, and perovskite could become important material to watch for all display developers, especially for microLEDs where perovskites could be used for both color conversion and actual emission (PeLEDs). The handbook is now updated to January 2025 and lists recent developments and new companies, initiatives and research activities. 

Reading this book, you'll learn all about:

• Different perovskite materials, their properties and structure
• How perovskites can be made, tuned and used
• What kinds of applications perovskites may be suitable for
• What the obstacles on the way to a perovskite revolution are
• Perovskite solar cells, their merits and challenges
• Perovskite QDs, LEDs, and other applications
• The state of the perovskite market, potential and future

The book also provides: a history of perovskite research, a guide to perovskite companies and developers, information on leading collaboration and development projects, a comprehensive list of perovskite companies, market updates and much more!

Perovskites are a family of materials with the same basic structure that can have an impressive array of interesting properties, including unique optical properties. Metal halide perovskites offer several advantages for use as components of LEDs and displays. They are direct-bandgap semiconductor materials that possess high photoluminescence quantum yield (PL QY) reaching 100%, they have narrow and symmetric PL peaks (full width at half-maximum about 15–30 nm, which is even better than for the traditional QDs) that enables wide color gamuts and they can easily be synthesized and processed at room temperature, or vapor-processed at low temperatures (typically <180°C) using inexpensive precursors.

Perovskite materials can benefit the MicroLED industry in two ways: as materials for color conversion (using perovskite-based QDs) and in perovskite-based LED emitters. Much R&D work is taking place on both these fronts, and interest seems to be growing.

Researchers at MIT have developed a bottom-up approach for precise and scalable formation of perovskite nanocrystal arrays with deterministic control over size, number, and position. This new technology enables the deposition of halide perovskite nanocrystals with precise control over the location and size of each individual crystal, integrating them into nanoscale light-emitting diodes.

The researchers demonstrated deterministic arrays of CsPbBr3 nanocrystals with tunable dimensions down to <50 nm and positional accuracy <50 nm.

MicroLED-Info and Perovskite-Info are happy to announce the 2023 edition of The Perovskite Handbook. This book is a comprehensive guide to perovskite materials, applications and industry, and it is now updated to January 2023 and lists recent developments and new companies, initiatives and research activities.

Perovskites are an exciting class of materials that feature a myriad of exciting properties. Perovskites are now entering the display market, with applications in quantum dots, LEDs, lasers and more.

Reading this book, you'll learn all about:

• Different perovskite materials, their properties and structure
• How perovskites can be made, tuned and used
• What kinds of applications perovskites are suitable for
• Perovskites Quantum Dots
• Perovskite solar cells, their merits and challenges
• Perovskites-based LEDs
• The state of the perovskite market, potential and future
   

The book also provides: a history of perovskite research, a guide to perovskite companies and developers, information on leading collaboration and development projects, a comprehensive list of perovskite companies and much more!